How do I add a popup to my blog on WordPress.com to collect emails?

How do I add a popup to my blog on WordPress.com to collect emails?

[:en]podcastitunesbutton

Digital Nomad Stitcher

JourneyFeed.com/Ask

This question from Mav we answer the questions about adding a popup to her blog. The widget can be found on WordPress.com’s widget library, completely free.[:]